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      ER tubules mark sites of mitochondrial division.

      Science (New York, N.Y.)

      Animals, COS Cells, Cercopithecus aethiops, Endoplasmic Reticulum, physiology, ultrastructure, GTP Phosphohydrolases, genetics, metabolism, Humans, Membrane Proteins, Microscopy, Electron, Microscopy, Fluorescence, Microtubule-Associated Proteins, Mitochondria, Mitochondrial Proteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Transfection

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          Abstract

          Mitochondrial structure and distribution are regulated by division and fusion events. Mitochondrial division is regulated by Dnm1/Drp1, a dynamin-related protein that forms helices around mitochondria to mediate fission. Little is known about what determines sites of mitochondrial fission within the mitochondrial network. The endoplasmic reticulum (ER) and mitochondria exhibit tightly coupled dynamics and have extensive contacts. We tested whether ER plays a role in mitochondrial division. We found that mitochondrial division occurred at positions where ER tubules contacted mitochondria and mediated constriction before Drp1 recruitment. Thus, ER tubules may play an active role in defining the position of mitochondrial division sites.

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          Author and article information

          Journal
          21885730
          3366560
          10.1126/science.1207385

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